How can I use the BI Noise Texture in Cycles?
The short answer is "you can't." There is not a 1:1 correlation between Blender Internal materials and Cycles materials. The Clouds material is similar to the Noise node in Cycles, but not quite the same.

The longer answer is that you can make just about any kind of material you need to in either renderer, but you'll have to use different techniques from one to the other. You should start with the Noise node in Cycles, and then tweak it until you get something that looks like what you want. You'll have to play with the settings on the Noise node itself, but you'll almost certainly need to add a Ramp node to control the hardness of the noise.

Anything beyond that is really outside the scope of this site. Please keep in mind that it's not a forum. This is a Q&amp;A site. We love to help, but this site works differently than most people expect. It's not designed to handle conversations, rather it's designed to handle discreet questions with clear answers.

Hope that helps!